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<p><strong>a</strong>. For normal single vision glasses, we offer glasses with SPH from -18 to +10, and CYL -4.50 to +4.50. </p>
<p><strong>b</strong>. For progressive glasses, the prescription we can make is SPH: -10.00~+6.00, CYL: -4.00~0.00, and ADD: +0.75~+3.50. Sorry we could not make with ADD over +3.50. </p>
<p><strong>c</strong>. For bifocal glasses, the prescription we can make is SPH: -8.00~+4.00, CYL: -4.00~0.00, and ADD: +1.00~+3.50. Sorry we could not make with ADD over +3.50. </p>
<p><strong>Notice</strong>: With a strong prescription, you are suggested to choose a full frame (better made of acetate material) with narrow and small lens. And high index lenses are necessary. </p>
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